In Testing the Difference Between the Means of Two Normally

question 33

Multiple Choice

In testing the difference between the means of two normally distributed populations,the number of degrees of freedom associated with the unequal-variances t-test statistic usually results in a non-integer number.It is recommended that you:

• A)round to the nearest integer.
• B)change the sample sizes until the number of degrees of freedom becomes an integer.
• C)assume that the population variances are equal,and then use df = n₁ + n₂ − 2.
• D)None of these choices.

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Definitions:

Transtheoretical Model

A psychological model that outlines stages of change individuals go through in modifying behavior, from precontemplation to maintenance.

Contemplation Stage

A stage in the Transtheoretical Model of Change where an individual is considering making a change in their behavior, but has not yet committed to action.

Habit

A regular practice or routine that is hard to give up, often performed automatically and can influence one's health and behavior significantly.

Motivation

A mechanism that triggers, steers, and upholds activities focused on attaining objectives.